How many `σ` and `π` bonds are present in each of the following molecules?
(a) `HC≡C CH=CHCH_(3)` (b) `CH_(2)=C=CHCH_(3)`

Explanation

(a) `sigma_(C-C):4:sigma_(C-H):6,pi_(C=C):1,piC-=C:2`
(b) `sigma_(C-C):3,sigma_(C-H):6,pi_(C=C):2`